$6x+3^2$
$30\left(3x+4\right)$
$\lim_{x\to4}\left(\frac{9x^2+9x+2}{3x+1}\right)$
$\frac{4x}{\left(x+2\right)\left(3x+2\right)}$
$\int\frac{8}{3cos\left(2x\right)+1}dx$
$\int_0^2\left(x\sqrt{16-x^4}\right)dx$
$\int\left(3x+5y+6\right)dy$
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